Hi, I've uploaded a lot of data into a wrong account. Is there a way to filter data by device ? I'd like to filter everything that was measured by a forerunner 410, download it, remove from my account, and then upload it to my girlfriend account. Is that possible ?
No, not given the interface provided by Garmin Connect.
You shouldn't have to export them from Garmin Connect before importing them into the correct account. There should be a folder on your computer that contains all of the .fit files for activities uploaded from your device. The location of those files depends on your operating system as well as the software you are using to access your device. If you are using the ANT Agent, then this page gives you an idea about where you can find them. If you are using Garmin Express, then this page will tell you where to look. You want to find and upload the .fit files for your device.